Nature of Operations (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Total consolidated operating income	$ 323.7	$ 278.7	$ 260.0
Interest expense	35.3	27.1	22.9
Other non-operating (income), net	(9.9)	(6.0)	(5.6)
Earnings from continuing operations before income taxes	$ 298.3	$ 257.6	$ 242.7